# Relationship history for MSHA mine 0403210

Current hierarchy: **Lawrence R  Hitchcock; John  Hitchcock → Hitchcock Brothers Cinders → Putah Creek Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Henry'S Sand & Gravel → Putah Creek Plant; 1950-01-01 to 1979-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Loudermilk Henry & C A Pivniska → Putah Creek Plant; 1950-01-01 to 1979-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Loudermilk Henry & C A Pivniska → Henry'S Sand & Gravel; 1950-01-01 to 1979-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence R  Hitchcock  et al → Putah Creek Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hitchcock Brothers Cinders → Putah Creek Plant; 1979-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence R  Hitchcock  et al → Hitchcock Brothers Cinders; 1979-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Hitchcock  et al → Hitchcock Brothers Cinders; 1979-04-30 to current/open; source msha-controller-operator-history